%bibliografia per riferimenti a doc esterni usati
\cleardoublepage
\addcontentsline{toc}{chapter}{\bibname}
\begin{thebibliography}{9}

\bibitem{xml:elementi}
w3c,
«Extensible Markup Language», \\
\url{http://www.w3.org/XML/}.

\bibitem{xsd:elementi}
w3c,
«XML Schema», \\
\url{http://www.w3.org/XML/Schema}.

\end{thebibliography}